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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc00925e1981f097c680e6bcf89faed47d45be2cca9086149331e1ae09cfba89' 
  AND token = 'zq9bsf8mvE9rL4ICeOGXpew+9MMs2qGmqzObH0ldPSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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