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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cffad4e6f681446588b26dcb680252c7a7d80eed07a9635e02cb10ee4fd5b62' 
  AND token = 'zKil5353I2iHtb7GA6Ml2IID0T7URqn6rzMkYuHTehQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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