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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae38911a0d47fa8ad222b6b8e3edd16986de289f7871f58a36395be62b7ae7cf' 
  AND token = '6qnXkZngbDxp86M6K9QB2nCtlKPSCOrvvWd5tRhqgMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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