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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c83bcac78e1981c6579bbd16b81e9a8b9e3fb9f97c3acf363f598528c9d915f' 
  AND token = '4xee1qPSRa0IwTSSzJkjPikk1yk/FYVLKGzF09pSusA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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