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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f95adda2f12bc132c46e2c1e324b626becc2a5ac3c58196dba307b25918a54' 
  AND token = 'hikFw2foOUKyIGL0brKLHI6ODmi20B/jK6E45RB5t/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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