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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c728ef968b87aa706d0dce529d2b42710a8bef85c1075c6347c270125c821e76' 
  AND token = 'I4ckYZYeEkbV64M/EmZRZiLddaQm0mi7x5SAs2DeCN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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