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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9542d21d1583d9cd1bb8ecc190fa059ae50d0c63b06cd98e19a430c939c0b571' 
  AND token = 'SYg+973A7aENvrN0xqHsoI1g7YxY3Pyt3yeLuxXqQm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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