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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37528f1876e050e1fd9479cb2378c119c53efe71c73130d77571cec0370bee96' 
  AND token = 'YQdDsRDP1xn3iMN4R+O2RE6pXNJn5OPjuW6Q9kCuYbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}