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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf7d5cbda29cf24f25c697cfb16618960505af3bbf3a0fc09f438d9b47b2e14' 
  AND token = 'Xqub5MtutvASLms4iujSBjg8ftQAe2GjdCeQf/w/HJE=' 
  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"
    }
  }
}