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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68c37f32e510065bfc73e7e5d4f24950cd6abc64e29ff4bc013bfa3d7fa0751' 
  AND token = '9/VYDmyY9j+UQRzvc5BiBoBc6gqy13eB7Q9jgNmTaF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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