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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae99868c297b042b95c52117a36a420cd201162b129efd0bd1c427352146de96' 
  AND token = 'll24h7OwKY2/Rt9g6IeQ8enMLxqW33SEfqGEJlbtgd4=' 
  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"
    }
  }
}