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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a8445597ed29c855467b2b64096bef82894b6d403cd07f01f2b9f9dbfbc256' 
  AND token = '/ctO1NK+90XLxWMgiDYUsl0+4q3nxatBxlARLWF6ans=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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