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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6528a5beef13bd28f28d7a60d07207325976ecd725bf1f1890f6ce8435fed908' 
  AND token = 'oLhN4T6FLhlFNZmLyJJwLm0pl7rX3teKkSvuPbnbtEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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