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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c1fcd3b7987afe814b4c5b4c5ae7e2bea289f6c74ce4d64928ed22b9c50d7c' 
  AND token = 'F0hC4bmwOfnA0aq96Zx3ItgQLWDSAdKYGkWSjM2zNQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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