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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0640644bfbe3ce954bd04da6137a0914470ae1cffafdfe038244667acb38a46c' 
  AND token = 'rPbi67zwduK2DN0BoHuROD9F/O7xGjHfM2P5devXCDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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