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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b2b69c9a0975ba4c58a29eaaed498de3c14fc4d7a54b793f048f028abc4377' 
  AND token = '6QS8CM6I1++5Dys5rQ4Ndt4y7gEaha7VwnfwZgKWC9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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