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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78fcaf9debc5258671adbdcd340f8f83c1dd26ea063cc68287bda36aaa6e6f64' 
  AND token = 'Ee1NTB/Ftu5F6IinsE/56Ll2zd0fhtbTzTmfW8vUsqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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