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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2c9da4040f7f629317eaf629579e1ac69ee50643da009d2709dff32f77d7df' 
  AND token = 'fpMrKcQ6+kd21eZq2+tqP/bBDKF0Dn5HQqaY659MPMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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