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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dff5b2ef45a7f153f45bf811f47a59fddf9607cbbf5ffb115155bb232327b80' 
  AND token = 'E/gZSrRWV48xxSfqiZKvm4arul98iks8NjhfXnaH2FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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