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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df872e9b89739943c720c8a27a39e3c7e94d4441fe2ccb74538b6ab8ab7020b5' 
  AND token = 'URO8NSsW5nvtZP844EVjrUhh6n0XlJ46/LWGJ3O6yZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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