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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8faee74cfc95bacbe4ceaf8659b853926b2f2a108e789be17e9f7a952ba593' 
  AND token = '192KR7rNe7sHm05QxU++XSvclslTI/ZsE914mhEsG9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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