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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba10f0171a36fe140d4a69db02e424d891e374d32e956f12d54c8da7c0480438' 
  AND token = '3W4KvjpXYEoh2X7ASz7SAJQWtJrvvCIlDn10m+lKwTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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