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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22d56c18b5b1dd5ba674424753c027c5af472c8872952d01e0f12f11c3d7b3e1' 
  AND token = 'q0ngdQOzLunrMeRdl2eubVWjUDMdXjuLCG49LTBDe4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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