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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5317b81a4f66d55acd81138246cf8f716438cc09a431b3fd15c96300ff7c91f9' 
  AND token = '43geF7AQy838rjhRov6SCtL3GRetqt0S47lsRv3dmwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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