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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e16d09eda1803bb12438bbba2d8203776bc138222c196a6e2821b8ac70d8cab' 
  AND token = 'U1VJCo8lNCzul7J31pZmHz2vQ5Y5KfGNd5o1nEBjZvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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