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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a13b5332761b6786ea5e4aa1f92ebd7e933c1eef94c643b2aae68adf3c8efb' 
  AND token = 'SCmGHm2PriDhfZICPsqXv2RXHyUrZBo01oeG6HkWesM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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