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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f376b7d7f27177adb16ec5bb9bd9fa5128b7a0470982bb4fbf5a05a3a76bf332' 
  AND token = '2gjWVydo+H4C4/qlBplI2jyHeRfoqcNzKFv99zas0k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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