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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4daf387dd947a950880b47edd5cf05411d11e5826f500f740a682324c94ff8' 
  AND token = 'TNotQc1iL5rqnpi1q0l+9EarH+9LiIgMgpVhTyw1jKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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