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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8249aae2a71ccd24bb64e1bc4bc3367671d26dfb354cd9884c61f4eab1914a7c' 
  AND token = '25jEFWNnbbPh9/TQd0lo5bGNp/J6Pvte3cuscUHavvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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