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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a88d1d7e9e604cf1d42c4e1c1c17e337d3c7f8be752d519fe95f67c39872c5e' 
  AND token = '2Dj8lgY0crScarP9sqv6bRHRX93LiAfldSjxcUtxPFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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