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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909b239a8419f3d1d9093b8321dfc3aadd6d1a6ac9ee2e6f1d67bb5e24dbc4f6' 
  AND token = 'Wxqa+Nyhf0Jd5lVI7YDxCmYqB7omTki2v+bXiSNvaFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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