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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2718c71c81787092d9ef37ba6b499c4dae84f70ef20f434650921a74503d6dac' 
  AND token = '75YwUYE3kn+kcghv7C5XY5FMS+6QnuPD/4AQDn1tEYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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