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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07a99aff7459c41b2e4e5a06281606c1959747d7488d8d080b9626c746da9c0' 
  AND token = 'xsxyNdIwhXg2Z8DyBvLvDU7yxIgDr0aJ6l6YixX64Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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