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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c301f0c1ad96ad4667be96c433c70c3ccd44a070ff04cdc86f61256be642c7' 
  AND token = '1FhDokN1h9qA471fBeZpwn9d2W9R6rrpNIWDZ49d8OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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