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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b87728dbb05600b158b5c7e5a1e65c226979d042a8b57f544ce6138d58ae1f' 
  AND token = '60RSuleY5D+Z4ub4UoVlx7Mb09scyxzmnDUEEd2Ujzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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