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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ea1f6c39ed12b1a16bd9cce931280cb4b2b114d504b30a1ea1dbada3d30e4a' 
  AND token = '3NM+0ljDK1xkzzBKECcljRe2fCK/5TMy4kIOx7jT6Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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