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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340bacd927e4ba468f9aae3ef2e241ccea66bddc516165120177809f6321d0bd' 
  AND token = '0GEJ72zZnD4M/MJq+cMLFcdEmRYyH57QI3k2zmmGKcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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