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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c31e2f7d9808b1b5886dd89bef0778ba679958c6bf96d86e91ebb059320f7c' 
  AND token = 'X9xiYe3G+o0zh6Ijh3/Gsa/vEwDb0zhNi6Hj+IUuPHA=' 
  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"
    }
  }
}