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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d450937602f73351998c901353bfa203c4b84b7aef805d31f55144727089a0' 
  AND token = '+kfPTSq8VqMBzdznj+675oGSsBk4W6XdTsVVQoK76PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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