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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b2936d439a36614b46da3e3c0c0bf6eafeec2b34d8c844252b604135a2f7e6' 
  AND token = 'j3iSFvDIaes2HVJmC0E1Lvz/A8qGHRpJ1hmxSxmw+Co=' 
  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"
    }
  }
}