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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f58eb39503ffad6416a1b04e530f73813d68655afae86e9848a5b225c1d2db9' 
  AND token = 'eLYBzMh6jYnLq6hrs/5NI76pVcYO1P3CnS1lXU9Yyj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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