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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b96a0b912b424565452b799a98abddd6632adb9d9350a66d1cf81d3c81fbee' 
  AND token = 'IXaik8xh/MY8IJXskopNrtqaB5a58x77/T1chWnCD1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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