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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c199e7b9d67f4ddfdd062a929548f4ab8dcdd1f715685697db2dba7b930809' 
  AND token = '+upqODdYNxJrEIPlV4BsRxSYwc753YfMdFaR6oJr5bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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