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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1a42b7c4b7b80b400ce906ac04a933d437c89aab04a1ec7eac3229cc669521' 
  AND token = 'l6dmjcK2ZTV3xuZBrgyk/Aa2NugZE0kE8GrzxyLSl/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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