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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4513f3d298b3bd3bfa73f5b08bb195a8e0d821d48644d7d91392a431ed0bce' 
  AND token = 'drZi1tVCxMsDiZvzBNoGkSfjoTN/u2JrH6BcSuSmOKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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