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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243e1c13c7643fb979ae29d92c1a2ea263070430594aac30d76b9814212424b3' 
  AND token = '3fcqshv+eN2+JoJ9ecRmtU/HNQOOSczchRKaLcserXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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