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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7308a8b8b5d1bfcfe5b3660136a41106b5a559a1e7435d742eb4c9ddbf553657' 
  AND token = 'Do1KjR8aI5REdiO8O3smwbnqkry8p1emNianLNxH0i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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