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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddec6ebfb868fb29d97529b7c22577f8926945da890ac5434a56c72f1ec98334' 
  AND token = 'YuyMK8BXW7zba7BfT5ykzO9JaS9myBhtuxpEIQqVcwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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