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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76d7452567961a7a6780046a6a215ba8e2cae36971e1c1341b330f4d8d177b7' 
  AND token = '80oIrz/qlytOvfVLqzT0QvTA9Wo5iGrSbBfa9j+hfVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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