SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070adc247c25b92982b6e730adf6fd66237584334866111ede8c4cfb2ab76858' 
  AND token = '3QYVIV/ySzTmR3q/Lr+A82AgbtXonmMvdFAK++6OgLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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