SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f64706ab247e9905c7c4608de3278663d62fd9b13c42a4849397cec22f5bf4' 
  AND token = 'lQXBp3MR6aZGUGJbkrhvC1O4teLwo9G4Fs8YZODjbm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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