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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd98ccd1666aee05fa2aca2e90a534055f4ff764951f4ab95ab66f41428b335' 
  AND token = 'gBwmC1sU3aRkUbJoN/vw0a2Y2tSMYrBb7tPPmOh3Uz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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