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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b903bab61bc7d8fd534553eb39fa79dcd7751bf98bb9096aa0b27d6667f6012' 
  AND token = '2UKsd0kWTDMsAknm9lZfd9Exi0T25Uzx2wjnu4im8Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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