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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32e238d118e68497e09d8d4cd985b59dd7a2155652f46733f902462f62e1879' 
  AND token = 'FPT+C45Ob/CPi6S2O8ZhiceE6yZ8uPu60G0n+OsQDXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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