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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7670cf06651100d8d88538e4107dab51a6f5e6901bfca4b6e52baa023fe2bd0' 
  AND token = 'uiNMbwVQ9l9YCfHRmRg4gHu/99+qLZcaxak4K5M86/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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