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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f27a9b40ca656c61c5a2be066a0717f29e2b06c359c4669c61168efe13a097' 
  AND token = 't6ljMhCghWxWRtaBV7DmgHiFbohO6r6ao5OvZ6YwsjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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