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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a7fc17dae7d745c6a3e9123fee3c8499d9fce136ed90d96800819613891ab9' 
  AND token = 'QSqD6jzMzZ9uwIzoFgUWyl8b3L7403XL2iY5AGAyYW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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