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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46818ba7aaa3cce1595e45ede7c8fc5b91c3bafa773d8158e49316a1e630a6c0' 
  AND token = '18dU61pydGF8cAbosHmqd9li0onqigwpAUcDGdu79Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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