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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661def46318754d418a289c54b7776aa6387b64c6ddfbe2f67649852e107fe94' 
  AND token = 'KPTaOn9R9ayg4+b7e7QGI2Cb3JbFYGYXaidh6OWyXgE=' 
  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"
    }
  }
}